(a) Given below are certain situations. Analyse each and describe its possible impact : (i) A population of…
(a) Given below are certain situations. Analyse each and describe its possible impact :
(i) A population of bacteria living in temperate waters whose temperature increased by global warming.
(ii) The sperm encounters the egg when it reaches the oviduct in human females.
(iii) Self pollination does not occur in a flower that contains only pistil.
(iv) Egg does not get fertilised in a human female.
(v) When the seed is placed under appropriate condition of water and air in the soil ?
Solution
(a)
(i) Most of these bacteria would die, but the few variants resistant to
heat would survive and grow further.
(ii) Fertilization occurs to form a zygote.
(iii) Cross pollination may occur leading to fruit formation. / No
fertilization. / No fruit formation.
(iv) If the egg is not fertilised, the thick and spongy lining of the uterus
breaks and comes out through vagina as blood and mucus, known
as menstruation. / Menstruation will take place.
(v) The seed will develop into a seedling. / Germination will take place.
OR
(b)
(i) When spores land on a substance and get adequate moisture and
temperature, it will develop into new Rhizopus.
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(ii) New plants grow from the buds located in the notches of the leaf.
(iii) The pollen tube will not be formed. / No fertilisation will take place.
(iv) Fertilization /Pregnancy will be prevented.
(v) Each fragment or piece grows into a new individual organism.
SECTION – B
(Chemistry)